Elevator safety-stop.



C. ANDREWS, JR.

ELEVATOR SAFETY STOP.

APPLICATION FILED FEB. 2. mm.

Patented June 15, 1915.

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NORRIS-PETERS 00., PHOmLITHOv, WASHING TON. D. G

NITED STATES OFFIOE.

CHARLES ANDREWS, JR., OF ROCKFORD, ILLINOIS, ASSIGNOR TO ANDREWS WIRE & IRON WORKS, 015 ROCKFORD, ILLINOIS, A CORPORATION OF ILLINOIS.

ELEVATOR SAFETY-STOP.

Specification of Letters Patent.

Patented June 15, 1915.

Application filed. February 2, 1914. Serial No. 815,969.

To all whom it may concern:

Be it known that I, CHARLES ANDREWS, Jr., a citizen of the United States, residing at Rockford, in the county of Winnebago and the State of Illinois, have invented certain new and useful Improvements in Elevator Safety-Stops, of which the following is a specification.

This invention relates to safety-stops for elevators; and it is the object of my invention to provide a simple and efficient means for automatically stopping the travel of an elevator should the same approach within a certain range of a floor and have any object protruding beyond an entrance slde of the elevator such that would collide with the floor if the elevator were continued in its travel.

In the accompanying drawings: Figure 1 is a vertical sectional view through an elevator pit as taken on the line 11 of Fig. 2, and shows an elevator approaching a fioor and carrying a passenger who has accidentally fallen and is in such a position to cause operation of the safety-stop. Fig. 2 is a plan sectional view through the elevator pit taken on the line 22 of Fig. 1. Fig. 3 is a similar plan sectional view but taken on the line 33 of Fig. 1. Fig. 4 is a detail plan sectional view taken on the line 44 of Fig. 1.

The elevator and associated building structure is shown in a diagrammatic manner and comprises a ground floor 5 and upper floor 6 intersected by the elevator pit 7 which extends below the ground floor; and mounted slidable vertically on ways 8 in the elevator pit is an elevator 9 which is operated by suitable mechanism (not shown) that is controlled through the cable 10 by an operator on the elevator.

Located beneath the upper floor 6 at a suitable distance, preferably at from one to two feet, is a horizontal rod 11 positioned within close proximity of the elevator range of movement, being supported at each end by cables 12 which are guided in pipes 13 and are run over sheaves 1 1, having weights 15 attached for the purpose of counter-balancing the weight of the cables and parts connected therewith. The ends of bar 11 are mounted in guideways 16 which have a stop at their lower end to limit the down movement of the bar. The cables 1.2 depend from bar 11, to below the ground floor and are fixedly connected at 17 to levers 18 and 19, these levers being both mounted as rocklevers on a rock-shaft 20. The lever 19 has an end 21 which has an aperture 22 through its outer end; and a cable 23 or other suitable connecting member, is connected at 24 to the controlling cable 10 and depends through said aperture 22, having a weight 25 attached to its lower end for the purpose of keeping the cable taut and also as a stop for effecting a one way connection between the lever 1921 and cable 23. It is obvious from the foregoing that the cable 23 may be moved up and down independently of the lever 19, and that said lever will operate said cable only when moved by upward movement of the rod 11. This is for the purpose of allowing the safety-stop which is operated from the bar 11 to remain stationary normally, irrespective of movement of the control cable 10, which must be operated every time the elevator is stopped or started.

To start the car in its up travel the cable section 26 of the cable 10 is pulled downward, said cable in its normal position maintaining the weight 25 at a distance below the end of lever 21; and in Fig. l is shown the cable section 26 so operated, the elevator being in its upward travel and the weight and stop 25 having been moved into operative relation with the lever 21, such operation being negligible in effect on the bar 11. Should any object protrude beyond the entrance side of the elevator during its upward travel. as for instance a passenger having accidentally fallen and having his leg so protruding, as illustrated in the drawings, the protruding member would be seriously injured by being wedged between the under side of the floor 6 and the elevator, but for the contact of said member with the bar 11. This contact raises the bar which is easily done because of the counter-balancing effect of weights 15, and rocks the lever 19-21, thereby moving the cable 23 downward and likewise the cable section 27 of the cable 10, which operation of cable 10 stops the elevator operating mechanism and the travel of the elevator. This operation is in effect the same as though the cable section 27 were pulled downward by the manual operation of the operator on the elevator.

The fact will be noticed that the means for operating the control cable in case of accidents of this nature is most efiicient and effective in its operation and being operable without any harm to a protruding limb, the operation being through direct connections eifecting instantaneous stopping action. Bars such as 11 may, as is evident, be'placed at any number of floors and be connected by cables 12, the weights 15 being proportioned accordingly.

I claim as my invention:

1. In an elevator safety-stop, the combination with an elevator and a control cable for controlling the travel thereof in both directions, of a bar extending horizontally across an entrance side of the elevator pit, a vertical cable attached to the bar, the upper end of the cable having a weight attached for counter-balancing the weight of the cable and parts connected thereto, a pivoted rock-lever, the lower end of the bar-cable being attached to the rock-lever, and a connection between the rock-lever and controlling cable operative by the rock-lever in but one direction, whereby the controlling cable may operate in opposite direct-ions without affecting the bar-cable, but is itself operated by said one-direction operation of the rocklever when the same is rocked by its cable.

2. In an elevator safety device, the combination with an elevator and means for controlling the travel thereof, of vertically movable rigid means located above an entrance to the elevator-pit and in proximity to the same, mechanism connecting the elevator controlling means and sald rigid Copies 01 this patent may be obtained for means for stopping travel of the elevator by upward movement of said rigid means, said mechanism comprising cable means extending from said rigid means to the bottom portion of the elevatorpit, a lever pivoted in said bottom portion of the elevator-pit, having connections between said cable means and controlling means for operating the latter by the former, and means for counterbalancing the weight of said rigid means and parts connected therewith. V

3. In an elevator safety-stop, the combination with an elevator and a control cable for controlling travel thereof, of a bar eX- tending horizontallv across an entrance side of the elevator pit and in proximity to an elevator, a vertical cable at each end of the bar, each being attached thereto, the cables having one end depending from the bar, a rock-shaft parallel with said bar and located in the bottom of the elevator pit, an arm thereon for each of said depending cables and to which eachis attached, and an arm onsaid rock-shaft having an operable connection with the control cable, whereby said control cable will be operated by upward movement of the bar. 7

In testimony whereof I have hereunto setmy hand in presence of two subscribing witnesses.

CHAR-LES ANDREWS, JR. Witnesses:

J. MCCANNA, Jr., F. W. MAHoNY.

five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. v 

